Phosphorus derivatives of tetrafunctional aromatic compounds

ABSTRACT

DISCLOSED ARE BENZOBISPHOSPHATES OF THE FORMULA:   2,6-DI(Z=),2,6-DI(X-)BENZO(1,2-D:4,5-D&#39;&#39;)BIS-1,3,2-   DIOXAPHOSPHOLE   WHEREIN: X REPRESENTS HALOGEN, NR2 WHERE R IS HYHYDROGEN, ALKYL, OR CYCLOALKYL, HAVING UP TO 30 CARBON ATOMS OR ARYL OR ARALKYL HAVING UP TO 22 CARBON ATOMS, PYRROLIDINO, PIPERIDINO OR MORPHOLINO; Z IS OXYGEN OR SLFUR OR MAY BE ABSENT. THESE COMPOUNDS ARE EFFECTIVE AS ANTI-WEAR AND ANTIOXIDANT ADDITIVES FOR LUBRICATING OILS. THEY ALSO HAVE FLAME RETARDANT PROPERTIES.

United States Patent Oifice Patented June 25, 1974 3,819,748 0 PHOSPHORUS DERIVATIVES OF TETRAFUNC- acetone & TIONAL AROMATIC COMPOUNDS CIEP Poh P Lothar G. Dulog, Sint Martens Latem, and Sylvaiu A. R. G1

Dewaele, Evergem, Belgium, assignors to SA. Texaco 0 0 0 0 Belgium l LV., Brussels, Belgium 111 IV No D ig g 250712 When THB (I) is heated with a large excess of PO1 Us. CL R Claims and a small amount of water, the bischloridite (II) is 10 gbtained 118-314 percecrlit yieldi T1? lgIB (II) can e rep ace y e mixe crysta s 0 an tetra- ABSTRACT OF THE DISCLOSURE hydrofuran (TI-IF), described in US. patent application Disclosed are benzobisphospholes of the formula: $611 9 filed 9 giving 11 in 85 o o percent yield. The details are given In Examples 1 and 2. Z Z Table I contains several examples of runs. The bischlo- 4' 5 1 4 \u ridite II can be converted into amides as shown below. XP2 g: 0 g The reaction of THB (-I) with P001 does not afiord the expected bischloridate (IV). Therefore, IV was prea' 0 e e' o a pared in two other ways. First, the bischloridite II can wherein: Xre resents halogen, NR where Ris hydrogen, be chlonnated Cele gwmg solutlPn of III and alkyl, or cycl alkyl, having up to 30 carbon atoms or 9 THB can be converted MI by aryl or 'aralkyl having up to 22 carbon atoms, pyrrolidino, actlon W1t h Pcl5 m CC14- when the Solutlon piperidino or morpholino; Z is oxygen or sulfur or may be tteated Wlth, at r001? temperature, the absent ridate (IV) 1s obtalned as an nsoluble material. The over- These compounds are efliective as anti-wear and anti- 25 F yleld by the transformauons THB (I)' HHI 'IV oxidant additives for lubricating oils. They also have Percent and by the Sequence T flame retardant properties it is 5469 percent. Both methods are described in Examples 4 and 5. Tables II and III (Examples 6 and 7) contain data of individual runs. The bischloridate (IV) can The present invention relates to compositions of matter be converted into amides (see b 610w).

classified in the art of chemistry as phosphorus derivatives A18 0 the bisthiochloridate V cannot be prepared d1- d are (1 (I 3 2 dioxa pounds do not, unexpectedly, react with each other. Therepoun s p fore it was necessary to use the blschlorldite (II) as a pholes) and have the formula starting material for its preparation. A procedure was 0 0 elaborated whereby the bischloridite (II) is treated with an excess of PSCl and a catalytic amount of Et N. By

x-l PX this way, the bisthiochloridate (V) is obtained in an 8288 percent yield. See also Example 8 and Table IV 0 0 (Example 9). The overall yield for the conversion THB (rI)IIV in this way is 64-75 percent. The bisthiowherem: X represents halogen, NR where R is hydrogen alkyl, or cycloalkyl having up to 30 carbon atoms chloridate V has been converted into amides (see heor aryl or aralkyl having up to 22 carbon atoms, pyr- 10W) The preparations of the amides derived from the bisrohdmo P1P endmo or morphohno Z15 oxygen or sulfur chlorides II, IV and V are summarized in Tables V or may be absent.

These com-pounds are efiiective as anti-wear and antig gzgg ggifi i ig 2 ?gi"( f 6 S g; oxidant additives for lubricating oils. They also have t reactio of th i flame retardant pmperties' II I V i iz tli f ur e uivalent; e am 0 on e The starting material for preparing these compounds is or 1 q 1,2,4,S-tetrahydroxybenzene, a practical synthesis of which Z O Z is described in commonly assigned patent application \n Ser. No. 92,139, filed Nov. 23, 1970. P 4R2NH a The compounds of the invention can be prepared by 01\ Cl reacting 1,2,4,S-tetrahydroxybenzene (THB, (I)) by a O 0 series of reactions which may be summarized as follows: III IV or V 0 0 z z 0 o 0 0 ll \ll S S P P ZRzNHaHfl Psou I /I C1-P P-Cl -r P P RzN NR1 0{ \Cl 0 O (I) o o o 0 VI of a primary or a secondary amine R NH in an inert I P 013 P s 01 I V solvent (like ether, benzene or mixtures thereof) at room temperature (Method A) (reaction 1). Half of the amine R NH can be replaced by a tertiary amine like triethyl- Ch amine, Et N or pyridine (Method B). After mixing of the reagents, a precipitate of the amine hydrochloride 'R NH-HCl (or Et H-HCl or pyridine hydrochloride) P616 I is formed and the amide (VI) remains in solution. The '1 amine hydrochloride is filtered off and the product VI can be isolated by evaporation of the solvent. The yields of the crude products vary between 45 and 100 percent for the bisamidites (VI, Z is absent.) Table V (Example 10) between 62 and 99 percent for the bisamidates (VI, Z=O) Table VI (Example 11) and between 19 and 100 percent for the bisthioamidates (VI, Z=S) Table VII (Example 12). The bisthioamidates (VI, Z=S) also were obtained by heating a bisamidite (VI, Z is absent) with sulfur at 150 C. (equation 2).

From Table VII (Example 12), it can be seen that the products prepared in this way (method C) were obtained in smaller yields and in lower purity than the bisthioamidates (VI, Z=S) prepared according to equation 1 (methods A and B).

EXAMPLE 1 THB (40 8-), PCl (400 ml.) and water (1.6 ml.) were placed in a vessel provided with a nitrogen gas inlet, a sealed stirrer and an effective cooler. The vessel was protected against moisture by CaCl -tubes and a slow stream of nitrogen was passed through the apparatus. The liquid was heated to the boiling point under stirring and refluxed for about 16 hours. After this period, the HCl evolution usually is complete. To the hazy solution Et N was added gradually at 70 C. (between 1.7 and 3.4 ml.) until the solution became clear with a precipitate formed. This liquid was decanted at 70 C. and allowed to cool in a well closed flask to exclude moisture and air. The crystalline solid, the hischloridite (II) (85.5 g., 76 percent, mp 132144 C.) was filtered off in a glove-box under dry nitrogen. A second crop was obtained from the filtrate upon further cooling (6.1 g., 8 percent, mp 124134 C.). Upon recrystallization (from benzene) the mp rises to 141-144 C.

EXAMPLE 2 In a three-necked flask, equipped with a nitrogen inlet, sealed stirrer and a reflux condenser, provided with a CaCl tube, were placed 69.5 g. THB (I)-THF crystals, 1.2 g. (0.07 mole) H and 300 ml. (471 g., 3.42 moles) freshly distilled PCI Stirring and heating were started. The THB (I)-TI-IF crystals dissolved after about 30 minutes. Refluxing of the mixture was continued for 16 hours, whereafter HCl evolution stopped. The solution contained a white haziness.

To the hot mixture was added a few drops to 1 ml. of Et N or pyridine after which it was refluxed for a few more minutes until the haziness coagulated to an oily precipitate. The liquid was decanted from the precipitate and allowed to cool. The bischloridite (II, 32.6 g.) was obtained as white crystals of mp 118124 C. A second crop (20.6 g.) was obtained after reducing the amount of PCI;, to half of its original value. A third crop (3.3 g.) was obtained in the same way, giving a total yield of 56.5 g. (85.2 percent).

1 The yield was calculated for crystals with 8. THE content of 50 percent.

4 EXAMPLE 3 TABLE I Preparation of bischloridite (II) Bischloridite (II), m.p. C.

132-144 76 124-144 (Note 1)..- 8

Yield Run Procedure percent As in Example 2 using 69.5 g. THB (I)-THF crystals, 1.2 g. (0.07 mole) H10, 471 g. (300 mL, 3.42 moles) P013, 1 ml. pyridine.

NOTE.1 Recrystallization of samples from benzene raised the m.p. to Lil-144 C.

118-124 Impure fraction.

White crystals.....

EXAMPLE 4 In a two-necked 500 ml. flask, provided with a gas inlet tube and a reflux condenser which carried a CaCl tube, was placed 10 g. (36.9 mmoles) bischloridite (II) and 360 ml. CCl After dissolution of the solid, the flask was cooled in an ice bath, the solution stirred magnetically and C1 gas, dried over concentrated H 80 was bubbled through the solution until it escaped from the CaCl tube. The ice bath was then removed and when the solution had warmed up to room temperature, dry N gas was bubbled through the solution to blow out the C1 gas left. Some precipitate was filtered off and to the filtrate was added 5.2 g. (6.6 ml., 90 mmoles) acetone, which was dried before over Na SO After standing overnight in a flask protected with a CaCl tube, the bischloridate (IV) which had formed as a white precipitate was filtered off in a dry glove-box under nitrogen (9.5 g., percent). It melted at 235 C. (dec.).

EXAMPLE 5 5 g. (35 mmoles) THB and 18.3 g. (87 mmoles) PCl were brought together in a 500 ml. three-necked flask provided with a N gas inlet, a sealed mechanical stirrer and a reflux condenser protected with a CaCl tube. To this mixture was added 200 ml. CC], whereupon a vigorous reaction started. When the reaction became less vigorous the mixture was refluxed for 4 days. A precipitate was filtered off at room temperature and to the filtrate was added 5.1 g. (6.5 ml., 88 mmoles) acetone. After standing overnight the bischloridate (IV) (7.3 g., 69 percent) was filtered off as a slightly yellow precipitate.

mole) II, 550 mi. 0014 and 21.7 g. (0.38 mole) acetone.

1 The product is soluble in POCla and in THF. 1 The product cannot be recrystallized from acetone.

EXAMPLE 7 TABLE III Reaction of THE (I) with P01 Bisehloridate Yield percent Run Procedure 1 Before the acetone was added the solution contained the histrichlo- EXAMPLE 11 TABLE VI Preparation of the blsamidates (VI, Z=0) Method 01 Yield Melting preparation (percent) point 0.)

81 194-196. 61 106. 88 (Oil). 99 (Oil). 83 185-186 l The amounts of amine per mole of bischloridate (IV) are: Method TEE-1% moles amine HNR1; Method B-2 moles amine HNR: 2 moles 2 Pn'mene 81-R is a trade name for a tertiary alkyl primary amine, sold by Rohm and Haas.

ridate (III) as shown by the IR spectra. EXAMPLE 12 TABLE VII EXAMPLE 8 Preparation of the bisthioamidates (VI, Z=S) Method of Yield Melting Preparat1on of the Bisthrochlondate (V) preparation (percent) point (a Q) In a three-necked flask provided with a N gas inlet, 19 277-283. 85 220-222. a sealed stlrrer and a reflux condenser that carries a CaCl 90 172475 tube at the top are mixed together g. (36.9 mmoles) 2g gig- 33; bischloridite (II), 37.2 g. (22.8 ml., 279 mmoles) PSC1 m0 g and 0.18 g. (0.25 ml., 1.63 mmoles) Et N under nitrogen. 33 52%?" The mixture is heated under reflux for hours giving a 94 5 clear brown solution and an oil that sticks on the walls 3 @ig of the flask. The hot solution is decanted from the oil and 51 281-224 cooled in a refrigerator. The bisthiochloridate (V, 10.2- g figjgg 10.9 g., 82-88 percent) is obtained as a white to slightly 97 190-196 yellowish crystalline compound of melting point 145- 83 96mm 160 C. 100 265-270 EXAMPLE 9 pyrrolidino C 50 225-247. TABLE 1v 1\/ A so 242-246. Reaction of the bischloridite (II) with P801:

Bisthiochloridate Yield, Run Procedure (V), M.P., 0. percent piperidino o 42 210-260. 10- As in Example 8 using 10 g. (36.9 145-160 82 N A 228-237.

mmoles) II, 37.2 g. (219 mmoles) 1 and 0.18 g. (1.63 mmoles) 4 h a mor o1ino. A 57 191. 11- As( Example t l u sgr g 232.3 g. 137-155 88 N p mmo es g. mmoles) PSCls and 0.43 g. (4.27 mmoles) EHN. Primene 21-11 a B 4 100 (on).

1 The amounts of amine per mole of bisthiochloridate V are: Method EX A-4 1110165 amine RzNH; Method B-2 moles amine RzNH, 2 moles EtaN. In Method 0 the bisamidite (VI, Z is absent) is molten with two moles of sulfur at 150) C. TABLE V i 'llghe reactgin cairiel out at 0; O. t v 1k 1 Preparation of bisamidites (V I, Z is absent) 1 fig fi fi g ifi f fi f or 8 er a y pnmary amme' 4 The reaction mixture had to be heated to the boiling point for 3 to 6 Method 01 Yield Melting 50 hours, preparation (percent) point( C.) I A2 62 M41 Representative compounds according to the invention NHCH '1: A2 33 185486: were tested by the Navy Wear Test, the Rotary Bomb 2 3 ig Oxidation Test, the Mean Hertz Load Test, the Rust Test B 7 3 and the Copper Strip Corrosion Test. The test data demon- A 62 strated load carrying and anti-oxidant properties for the B 63 160-162 A 85 9115-91. PQ B 33 152-154 While the present 1nvent1on has been illustrated mainly B 96 164. B 100 m with reference to benzobisphospholes which are unsubfi- 3g stituted on the aromatic nucleus, it will be understood A 2 that the same is applicable also to analogous compounds A 92 76-71 having on this nucleus various non-interfering substituents such as alkyl, halogen, aryl, alkoxy, and alkylthio. N Pymndm" A 64 160430 What is claimed is:

/ 1. A compound of the formula: N Piperidino A 83 182-184. Z 0 o\ H II \b X-P P-X N morpho1ino A 45 194-197.

O 0 Prlmene 81-R B 100 (Oil). wherein;

The amounts of amine per mole of bisehloridite (II) are: Method $521 moles oi amine RzNH; Method B-2 moles of armne RzNH, 2 moles 2 The reaction was carried out at 0 C. I Primene 81-R is a trade name for a tertiary alkyl primary amine, sold by Rohm and Haas Inc.

X represents halogen, NR where R is hydrogen, alkyl, or cycloalkyl having up to 30 carbon atoms or aryl or aralkyl having up to 22 carbon atoms; Z is oxygen or sulfur or may be absent.

2. The compound according to Claim 1 wherein Z is sulfur.

3. The compound according to Claim 1 wherein Z is oxygen.

4. The compound according to Claim 1 wherein Z is absent and X is NH-pC H C H 5. The compound according to Claim 1 wherein Z is oxygen and X is 'N(C H 6. The compound according to Claim 1 wherein Z is sulfur and X is N(C H 7. The compound according to Claim 1 wherein Z is sulfur and X is NH-pC H C H 8. The compound according to Claim 1 wherein Z is absent.

9. The compound according to Claim 1 wherein Z is 15 sulfur and X iS NHC 2H25.

10. The compound according to Claim 1 wherein Z is sulfur and X is N(C H References Cited UNITED STATES PATENTS 3,671,434 6/1972 Metro et a1 260927 R X 3,686,367 8/1972 Cowling 260-927 R X LORRAINE A. WEINBERGER, Primary Examiner U.S. Cl. X.R. 

